You can
select text or image
copy and paste text or image
insert Clip Art
Select Text
Click the Select tool at the top of the Panel bar to select a block of text. You may then copy the selected text. Right-click for a shortcut menu. Then you can highlight or underline it, show it crossed out, mark places for text insertions or replacements, insert a hyperlink or note, turn it into a bookmark, or search for the first word in the selection.
Select Image
Click the Select Area tool at Edit > Basic to select a page area to be copied as image or to create a hyperlink for the area.
Copy and Paste Text or Image
Select Copy at Edit > Clipboard or from a shortcut menu to copy selected text or image.
Select Paste in an open document in another application (e.g. an Office application) to paste it.
Notes
The Cut, Copy and Paste commands may not be available if a PDF document is password protected against copying.
Copied text can also be pasted into comments or onto a typewriter tool cursor.
The font will be substituted if text copied from a PDF document has fonts not available on the receiving computer.
Insert Clip Art
Use the Clip Art panel to insert, rename or delete clip arts. You can insert both pre-defined and custom created clip art. Clip art is grouped in categories.
When creating a custom clip, most popular image formats are supported, including jpg, bmp, gif, and more.
To add an image file
Select Edit > Modify > Edit Object.
Right-click the document and choose Place Image.
Select a file type (jpg, bmp, gif, and more) then an image and click OK.
The image will be placed at the center of the page. Use the same tool to move it.
Optionally copy the image, save it, or add a transparency effect.
Use the Edit Object tool to edit objects
This Edit Object tool also allows you to make changes to images, and other objects. Click the icon just above the cursor for a floating toolbar.
Select an object with this tool, then
drag the 
cursor to move an object to a new location
drag the scale handles (red circles) to resize an object
drag the 
cursor to rotate an object. To get the rotate cursor shape, click on the red circle above the object. Drag it in the desired direction. While dragging, the cursor shape will change again. You can also use the shortcut menu to rotate an object.
Select more than one object, then use a shortcut menu to
Group or UnGroup objects, or
reorder objects with the commands Bring to Top or Send to Back.
Use the Edit Object tool to edit text
Click on a block of text in a searchable PDF. To modify text in an image-only PDF, first make it searchable (at Home > Convert).
Click the icon above the cursor for a floating toolbar. This tool is designed only to make minor last-minute changes to PDF pages. To make larger changes, used Advanced Edit mode, or return to the source document, modify it and generate a new PDF.
Add text using the Typewriter tool
Use the Typewriter tool at Edit > Modify to add text at any suitable place on a PDF page. The Typewriter tool enters text directly at the cursor position. When the PDF is saved, the entered texts become selectable objects, unlike texts entered as annotations, e.g. with the Text Box tool. Until the PDF is saved, spell checking can be run on the entered text.
For a comparison of Typewriter texts and Text Box text, see Text Box.