Changing the default login credentials to internet on my samsung phone I bought a Samsung galaxy chat phone a few weeks back. I experienced difficulties downloading whatsapp at the workplace, where we have access to wifi. As a result, I enlisted assistance of a technician, who ended up using his credentials to login to wifi, and successfully downloaded whatsapp and few other apps into the phone. 

Each time I have to login to wifi at work, the login screen comes with the technician's username and (the dots at the password window - for) his password. I have to delete these each time before typing-in my own, and it is rather inconvenient, even frustrating. How do I get rid of these default credentials of the technician and have mine (or blanks) instead?

Will greatly appreciate your assistance.
Thanks 
Silas
Mentioning your Android version would have made it easier to provide specific instructions, but then it's pretty easy

Press or tap Menu button &rarr;Settings&rarr;Wireless &amp; Networks &rarr; Wi-Fi

Long press your office Wi-Fi network &rarr; Forget

Go back to Wi-Fi settings page, your office network will show up (if it doesn't Scan for it). Enter your username and password and save. Subsequently, it will connect automatically and show your office network name instead of technician