I need to change the password on my Linksys e2500

Linksys router is the best network service provider between another router service provider, there are features provide high-speed internet, multiple connectivities, easy for installation and etc.
To troubleshoot Internet connectivity issues:
First of turn off your router and connect modem directly with your computer.
Login your router by following login manual steps.
Click the Smart Wizard Test button to access the NETGEAR online test page.
Under Router Status, and check your router has a valid IP address. For more information, see your router user manual setting.
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https://servicenumber.org/linksys.html

You actually may not have set up a password on the router. It comes from the factory with a default. The default username is left blank and the default password is "admin". If that doesn't work, then there is a different password on the unit. You can clear the password by doing a factory reset on the device, but then you will need to use the defaults to go back in a set up the device all over again. The external reset method is to press and hold the RESET button on the bottom or the back of the unit (it may be recessed into a small hole that you will need to use a paperclip on) for a minimum of ten seconds.

Unless you set one up, you will need to reset as I previously answered.

You might want to try the admin password: leave the user name blank, and enter the password "admin"

You could try to connect to your router with a CAT5e network cable. Then open your browser and open the webpage http://192.168.1.1
When prompted for your username and password, try password 'admin' (without quote marks) and leave username empty.

If that doesn't work, reset your router and configure all the options over again (make sure you have all required information for the settings). For more information, look at this knowledge base article: kb.linksys.com/Linksys/GetArticle.aspx?docid=6af0fc7147664d2eaef47a2189a1ffce_E2500_FAQs.xml

admin is the default out of the box if you changed it you have to reset router use admin then change it after you get back on line
go to linksys.com support type in your model # look thru FAQ's or download manual

You could do a factory reset. This way, the unit will revert to the default username and password. You'll need to reconfigure all the settings though.

If a password was set by user, no one else will know it if you forget it.
If the password needs to be reset to factory, so you can log in with the "default" password AND RE-SETUP EVERYTHING, then you'll need to reset the Linksys E2500 to factory defaults. You can usually do that via a special button or sequence of actions.
The E2500 manual will have specific directions for performing a factory default reset. You can download the manual for the E2500 from http://support.linksys.com/en-us/support/routers/E2500

Start to change:

1-Charger / Cable then;
2-Test; no luck?
3-Device is dead

By default, the router has a SSID ID of 'linksys', with *NO* security, and *NO* password. Configure the router to enable security, and to set the SSID and to set a password.

access the ipadd of your linksys then thats the time you can change your password. if you dont know the password then its time you reset your router and reconfigure it again.