here are many ways to make friends..I believe the most easiest way is to nicely introduce yourself to a new person in the group. Also try to understand what the opposite person interested in and talk about those topics..
Having the right friends is the key to having well being, more possibilities and more success. For this you have to determine the type of friends you want. Go where it is easy to meet new people, Find a local community, Find commonality with people, show your vulnerability side early on, reach out to people regularly and make connections between the people you know.