You're able to search by the alpahbet..
*screencap time*
If you select Username, it will list them alphabetically.
Ascending=A-Z (names with special signs come first, except fro ones staring with ~ or _)
Descending=Z-A (Names starting with ~ or _ come first, names starting with other special signs come last)
To search for a member using search:
And you'd just type in the member's name and hit search.
Both are easy to use, you just need to know these sortof little things.