Hover over the image you want to edit, and click on the paintbrush icon, then the inpainting tab:
Click and drag on your image to erase the part of the image you want to regenerate.
Click regenerate, or optionally, adjust your prompt to adjust the output of your image.
Some examples of what you can accomplish with inpainting
Remove extra limbs / fingers
Fix malformed bodies
Change the subject of an image
Fix letters / words
To fix text, erase the text you want to regenerate and leave your prompt the same, then click Inpaint.