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Thanks for posting your question here.
You can check this document to Add your logo - Google Apps Administrator Help,
Hope this answers your query.
Actually I couldn't understant how to connect the customers with my account, but I'm ok now.
Thanks for your reply.
Probably I misunderstood your question, do you want to know how to Sign in to your Admin console - Google Apps Administrator Help?
Let me know if this is the case
Regarding other questions please check here G Suite Reseller Agreement FAQ