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Hello and thanks for using JustAnswer.com I am Serge and I will try my best to assist you. Are you trying to change credentials of the router login? or wifi?
I am asking, because there is usually no username/pass to login to the modem itself, as it is controlled by ATT and they do not provide it to customers.
WiFi password ***** network name on the other hand can be changed.
will be waiting for your reply
Do you still require assistance on the issue?Will be waiting for your reply.