Problem after installing vanity sink

HI there,
I just installed an all-in-one vanity top/sink. 49x22"
When I was ready to hook up the p-trap to the pipe into the wall, there was a difference in the placement of the tail piece. I went to Home Depot and got a couple of pieces of pvc that shortened the distance. I was able to get the ptrap hooked up, though there is a tiny bit of stress on the tailpipe.
Now I have a leak from the where the drain meets the sink on the underside. It is tightened well I think, but still leaking. What to do next?
Please help! Thanks!
I'm in Ontario.
Klamity

Take that pop-up assembly back out and dope the fine threads; that will stop the leak.

leak

Loosen th e nut, and put some pipe joint compound or plumber's putty between the metal washer and the rubber one, then retighten it.

thank you

Thank you for your speedy replies. I will try this tomorrow and see if that helps.
Sincerely,
K

Klamity said:

I was able to get the ptrap hooked up, though there is a tiny bit of stress on the tailpipe.

Click to expand...

Not knowing what you mean by "a tiny bit of stress" if hj and RUGGEDs solutions don't work you will have to eliminate the "stress" to stop the leak.