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When you're profile is created, you will need to verify by clicking the link that will be send to you by email, this is to ensure that your details is not used to by intruders.
Now you are ready to login, please go ahead and do that , and you are ready to apply for membership of groups.
Step 2 - Group memberships
All work done in the PT and WG are organised in their relevant groups under their relevant organisations (ECC, Com-ITU, CERP and ECO). Find first the organisation, and then the PT or WG you want to be a member of. See more instructions here: Groups