@Ambarish SV Welcome to the Atlassian Community.
You should start with your Confluence Admin (maybe the IT people in your company?). They need to give you access to your Confluence instance.
If they have already given you access, they apparently did not use the email address that you are trying to log on with. You can work with them to sort that out.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.