In many drawing/drafting programs, the usual way to create "text on an arc" is to place a single letter and then create a "circular/polar array" duplicating the letter at equally spaced intervals around an arc - or around a complete circle. You then "edit text" to change each individual copy of the letter in the array to the appropriate different one. This will sometimes work in simple graphics programs if they have a "copy array" or "create array" function, and if it does it is a little easier than placing each character and then rotating each one separately.

Some photo-editing programs allow you to "distort" things, and you can type straight line text and then "warp" it to freehand shapes. If you don't see a way to do what you want in text instructions in your program, you might look for "warp" or "distort" functions in your help files. If this method works, it's usually easier to create and bend the text in a separate image, and then copy it onto your other artwork after the bending is done. It's the same method used to take the "love handles" off of Uncle Fred to make him look a little more studly in the family photos.

John