I have bought coins before but I don't how to add these netowrks to the ones I already have,
Here is a video tutorial how to add chains in your metamask wallet:
https://youtu.be/4i0875db5p00x6f259637dcD74C767781E37Bc6133cd6A68aa161
is this the HT huobi token to buy on ETH
Yes it is Huobi (HT) eth contract address. If you want to buy it, go to a ethereum DEX and paste this iaddress in search bar and swap your eth or stable coin to HT token.