You just want to send a link to a webpage to someone else using your GMail email account?
1) Go to the website that you want to link to.
2) Go to the address bar (where it says
http://www.....) copy the whole address by highlighting all of it, then right clicking on it and choosing copy
3) Login to your GMail
4) Click Compose to compose a new email
5) Right click in the body of the email and choose paste and it should paste your web address.
Don't forget to fill out who you want to send the email to and a subject.