Intercom and Cloudflare (SSL)

Hello.

I have a help center with Intercom and I need to assign an ssl certificate to the subdomain that gives access to this service.

From intercom they tell me to use Cloudflare but honestly I don’t know how to do it and if this will affect my main domain, email, etc.

Can anyone help me and tell me how to do it?

All the best. Thank you.