how to link my form to my websits

Depending on how your website is set up, there are several different embed codes:

https://www.jotform.com/help/67-Which-Form-Embed-Code-Should-I-Use

For most web pages though, I have found the iFrame code to be the most reliable:

https://www.jotform.com/help/148-Getting-the-Form-iFrame-Code