I need to change my WPA key, however I forgot my router username and pass (The one you enter in your browser after going to the router's ip address). Is there any way of getting them without reseting the router? Since I don't know the configurations set within the router.

Thanks in advance,
Thanks for your reply.
So basically the only solution is resetting the router and configuring it?
I viewed the TP-Link configuration pdf and noticed that I need a "PPP username and password". I'm assuming I need to contact Ogero to get them or am I wrong?
You could always bruteforce the router login using common lists.
I did try using bruteforce on the password field with a common list containing about 2 000 000 passwords, but kept the username as "admin".
The bruteforce took about 20 mins, If I were to bruteforce all combinations of usernames/passwords it will take shitloads of time :p. So I'm leaving bruteforce as my last option.
Can I email Ogero asking my PPPEO user/pass? If yes what is their support email address? I can't seem to find it on their site.
They normally change the credentials for the router when you give it to them or when you buy one from them.
Here it is : chebaro@ogero.gov.lb
Here's how you should ask them :

Could you give the username and password of the router of my DSL connection ?
The phone number is : 01******
The L number is : L69****
Thank you

Be as polite as you can.
try to check your browser history for any page for the router
Solved: Ogero emailed me the admin user/pass. Not sure if the email was a reply to the email sent to chebaro@ogero or the contact us form on their site. I received it from a nrifai@ogero. Anyway I can now login my router successfully. Thanks guys for your replies.