Remember, you can return to this page via your link in your email. (You must have an email account to be here, I suspect.)
Incredimail requires some setting up. I can supply you with a page offering instructions on setting it up to receive Gmail. However, those instructions get to be a bit technical.
I simply use Gmail (Google Mail) which I access from my browser. It only required I sign up, choose a password and user name, write those down and go back to the sign in page when I want to access it. If you wnat to use Incredimail, setup your Gmail account first. Write down password, user name and gmail address on paper. Then launch (might as well take a look at the links below first) Incredimail and follow the below:
If those instructions are not enough, here is an extensive guide from Wikihow:
How to Access Gmail in Incredimail Desktop
And here is help on using Incredimail itself.
Help Center Using Incredimail