In battle I can't even attack(it shows the attacks, but when I click on them it does absolutely nothing), and I can't even see my enemy. I just joined an hour ago and there's no way to complete my quest now. Thanks for any help.

Post a screenshot?
Try clearing your cookies&cache. Also, are you using a browser that is up to date? Try switching to another browser, too. Make sure you have stable wifi connection. Be careful to not have too much other stuff running in the background, especially if you have an old computer. Make sure your adblock (if you have one) is not blocking select elements of the site by mistake.

in a fight you click on the attack you want to use and then on the enemy that your doing the attack agenst. and then you click End Turn (then your pet(s) will attack and do damage)

It works now, thanks.

And are you using a laptop with the installed mouse? Somehow the mouse on mine doesn't allow me to click unless I click about five or six times (I use a plug-in mouse to play Sylestia). It may not be the problem since my last laptop didn't give me grief about this, but is something I noticed.