I have joined as a Tax Adviser. Could you please let me know how to proceed? What do I need to do next? How do I set up my profile?

That’s great to hear. The best starting point is to complete your profile using the guidance here: https://www.taxadvicenetwork.co.uk/tax-adviser-membership/profile-tips/

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There’s further guidance as regards related matters via links on the right-hand margin on that page.