The confusion you see in the responses is because you are evidently confused about the name of what you did. "Adventure Diver" is actually a certification beyond the beginning open water diver, so if you are not already certified, you did not get that certification. There are two possibilities for what actually happened.
- You did a Discover Scuba class, which the place you did it may have given their own "adventure" name to it. If that is the case, then you really have to start from the beginning in your local area. It is technically possible in some cases to apply what you did to that certification, but those cases will not apply to you, they won't help all that much if they did, and there is really no point in doing anything other than starting from the beginning.
- You did roughly half of the standard open water diver class, which gives you a scuba diver rating. This would be very unusual, so that is not where my money lies. If that is what happened, though, you just need to show your credentials to a shop and get the second half taken care of.