When working with frames, there are five aspects you need to control:
size of the frame – see Sizing frames
position of the frame – see Positioning frames
text flow around the frame – see Text flow around frames
text offset within the frame – see Setting the text offset to frames
Contents of the frame
The last of these is an easy matter – it's the same as editing text on the standard page. Also, note that you can exchange text between the frame and the page (or other frames) by using drag and drop – see Moving text for more details.