Had problems at first too, but a great little rta. Might be a bit tricky for a first rta though.
Is it only leaking right after filling?
If so, the leaking is due to a change in the tank pressure. To remedy this, fill the tank with the airflow closed. Twist on the cap. Take 2 small pulls with airflow closed, open airflow, take 2 puffs. Should be good to go.
If this did not fix it, it is for sure a wicking issue.
Wish i had photos or video, but will try to explain what I do.
First off, I don't do the most recommended wicking which involves putting the top ring on over the wick, and trimming at the base, tuck it in with a needle.
I run my wick thru the coils, put the ring on, pull the cotton up thru the ring, cut to less than 1.5mm longer than the ring, fluff it out, gently tuck it in just to cover juice holes. Take your time and tuck it in with a piece of wire to keep it fluffy. This is with 80%vg. 50/50 i used the other wicking method.