Metal feet for handbags come in different colours and shapes, but they are all very easy to use. Most of them have prong (legs) that go through the fabric and in some cases those are close together, sometimes they are apart as seen in this picture.
If the prongs are separated, you should get a set of “washers” inside the pack. The feet will go through the fabric, then the gaps in the washer and all you will have to do next is to fold the prongs backwards to secure in place (like attaching magnet snaps).
Here is a link to watch me using feet that did not need washers and also hear me talk about bases for bags.https://www.youtube.com/watch?v=wnpylLBaFHs