Repotting orchids, I have 2 shop bought orchids, kind you get in the supermarket, I need to know how to repot?

they have roots growing out over the top of the pot, they have flowered at least 3 times each since I had them about a year ago (which I wasn't expecting) They're in a kind of woody substance but I don't think, any soil.

Should I try and put them in a bigger pot and cover up the new roots, and if so what soil/wood should I use.

I tend to forget to water them but try and spray them about once a week, at the moment they are living on the kitchen window sill.

Any help will be appreciated.

Repotting orchids, I have 2 shop bought orchids, kind you get in the supermarket, I need to know how to repot?
I saw a Georgia Public TV program on Saturday about repotting orchids. Hopefully, this will tell you everything you need to know. They made their on potting mix but I bought mine at Lowe's-it's for orchids. It was a very informative program. Go on the Georgia Public Broadcasting site, click on Gardening in Georgia and type in orchids in the search box. That will get you to the episode that I saw. Good luck, I hope this will help.

horns