How to make cement pots cement
Do you mean concrete flower pots?
I would buy two plastic pots that nest inside of each other, as molds.
I would spray cooking oil on them as a mold release.
I would mix up a small thin batch of the concrete mix (like Quickcrete) in a 5 gallon bucket, pour a small amount in the big plastic pot and then put the smaller pot in the big one & weight it down with bricks, letting the concrete squish up the sides.
Here are 3 ideas on hometalk:
https://www.hometalk.com/8939467/easy-diy-concrete-planter. https://www.hometalk.com/30828739/diy-concrete-planter. https://www.hometalk.com/18036286/concrete-pots-in-15-minutes
Do you want to put a cement pot on cement?
Buy a bag of Postcrete and add water.