Answer 1

Rishika!
Please link your code so we can solve.

Problem will be with URL. You are not entering correct URL of website where you want to go.
<a href="url"> Go to Page </a>

Answer 2

Rishika! Make sure u have added a valid extension .
E.g.
www.
http://
https://
Etc.

Also if u have added http or https,

Make sure there is no space between https & : or //