Can Anyone Say how we can Swap coins?

Cuz if we select coins that we wud like from a person..........how will we get the coins.......is it through post??
BTW im new to numista

Yes, most of the times we use the old fashioned post to get the coins. I think that will not change, unless we start collecting digital currencies

There is a guide on swapping, I think that's a good place to start

https://en.numista.com/numisdoc/swap-on-numista-a-complete-guide-147.html