Grouping drawing markups enables you to combine them so that you can work with them as though they were a single object. You can move or delete the group, set its status, change its appearance, etc.

Select the Hand command or the Select Annotation command, and do one of the following:

Use the Hand command, the Select Annotation command, or the corresponding Drawing Tool to select a drawing markup. 

Foxit PDF Editor adds PSI support for free-form annotation. You can use Surface Pro Pen or Wacom Pen to add free-form annotations with PSI in PDFs. Detailed steps are as follows:

• (For Surface Pro users) Choose Comment > Pencil, and then add free-form annotation as needed with Surface Pro Pen;
• (For Wacom tablet users) Connect your Wacom tablet to the computer, choose Comment > Pencil, and then add free-form annotation as needed with Wacom Pen.

1. In the Comment tab, select a type of drawing markup. Then click and drag to make a shape you want to mark up. 
2. (Optional) Sizing handles (small circles or squares) appear at the corners and sides of a selected drawing markup. You can drag these handles to change the size and shape of the markup.
3. (Optional) When you select a drawing markup comment, you will find a toolbar floating around the comment, which allows you to change the color of the comment quickly.

Callout and Textbox are designed for users to create comments in a callout text box or a box.

A callout text box contains a text box and an arrow, which is especially useful when you want to single out (but not obscure) a particular area of a document. 

You can use the Typewriter command to add comments anywhere on a PDF. 

A Typewriter comment 

For how to add a file as a comment and work on it, please refer to File Attachments in Chapter 5. 

Do one of the following:

1. To add a note comment, please click the Note command in the Comment tab, click where you want to place the note. 
2. Add a text message to the Note comment and change the appearance of the Note comment. See also Add a text markup comment.
3. Drag its lower-left or lower-right corner to resize the pop-up note. 
4. Click and drag the title bar of the pop-up note to move its position. 

You can use pin tools to add comments by adding notes and attaching a file. A note comment leaves a note icon on the page where you placed it, and a pop-up note for your text message. Using the File command, you can attach a file in the document as a comment.