The text box works as expected for me, place it and start typing.
As far as remembering your last used settings here are a couple of things to look into.
Revu-->Preferences-->Tools-->Markup, make sure Dynamically Set as Default Properties is checked. In order for this to work you can select your tool, make the changes to the properties, and then place your markup. All future markups will use that as the default.
Your other option is to place your markup, make changes to the properties, and then select the box on the properties tab called Set as Default.