I wasn't familiar with apache directory studio either. I ended up installing Eclipse, then installing it that way. After that it seemed intuitive. Googling it should help. I did get stuck on trying to connect to LDAP with the proper credentials. You're able to connect without authentication but then you are only able to read it. I stumbled on a few topics here and it turns out you have to use your ROOT DN and the Password in LDAP Settings to authenticate with. Of course, I'd suggest making a backup of LDAP before messing around with it.