Relate UK has an incredibly comprehensive website. This page has the answer to lots of common problems: Get Help | Relate
If you have a pressing issue and would like an immediate one-off conversation with a counsellor, Relate UK give you the option of a phone call or email with a counsellor.
To chat with a counsellor: Schedule Appointment with Relate
Email a counsellor: Message a Counsellor | Relate
You can also search for articles on a particular topic. In the search bar lower down type the issue you would like help with and scroll down for a number of helpful articles: Get Help | Relate