how to rotate a text box?

There is no user interface to rotate an annotation (e.g. a text box annotation), but you can do it via JavaScript. Bring up the JavaScript console (Ctrl-J or Cmd-J), then select the annotation you want to rotate and execute the following line in the JavaScript console:

this.selectedAnnots[0].rotate = 90;

This will rotate the selected annotation (assuming that there is only one selected). This can be done in a script that gets executed from a menu item or a tool button.

To learn about how to execute a JavaScript in the JS console, take a look here: https://acrobatusers.com/tutorials/javascript_console

Karl Heinz Kremer
PDF Acrobatics Without a Net
PDF Software Development, Training and More...
http://www.khkonsulting.com

I thought you were talking about a text field. For a text annotation you can use this code to change the size and color of the text after you rotate it using Karl's script:

var spans=new Array();
spans[0]=new Object();
spans[0].textColor=color.black;
spans[0].textSize=12;
spans[0].text=selectedAnnots[0].contents;
selectedAnnots[0].richContents=spans;

To change the color and size of text, you would bring up the properties toolbar (Ctrl-E or Cmd-E). Depending of what you've selected, you can either modify the properties of the box:

Or, you can modify the properties of the text (e.g. font, size, color):

Karl Heinz Kremer
PDF Acrobatics Without a Net
PDF Software Development, Training and More...
http://www.khkonsulting.com