I suppose this pool is for ASICs and nicehash only. Mining difficulty is very high.
You can change difficulty, or it will automatically change after a while. add <,d=YOURDIFF> after C=TRLN in password field.
Honestly, im not sure if there is a reason for mining scrypt with anything else than ASIC these days..
Trying to set -p c=TRLN,d=256 but it not work... Still difficulty is huge...