How do I pickup bottom piece

Help I am a new knitter and am trying to make a felted bag, I wanted to make the bottom and then continue up the side on circular needles however I couldn’t figure out how to do that and so i binded off the bottom and was going to start that way howver I still couldn’t figure out what to do?

Are you using a pattern? If so, can you post a link to it?

If not, how did you make the bottom? Did you just make a rectangle? If so, all you’d need to do is follow the instructions on the video located in the Basic Techniques section. Mouse over & click on “…more”, then scroll down to "Picking Up Stitches aka “Picking up stitches and knitting”.

Good Luck!