Only able to access three banking web sites - D-Link Xtreme N DIR-655 Wireless Router

download to what ?
A mobile phone or tablet ?
An Apple phone ? Itunes needed
An Android phone ? Google Play store

A computer ? Apps don't work need to access bank's web site for online banking .

Access their web-site, and click their link to their E-banking site.

Every bank has a different process but in outline you:
1 go to your banks web site.
2 identify yourself in their login process, typically by entering your account details and some personal information that they can verify as belonging to you.
3: register an email address with them.
The bank will confirm the email address by sending an email to you using that address.
4: Use the link sent to you in the same email to access the banks internet banking site and set a password for your login.

Like I said all banks processes will be slightly different. You can get specific help and even have them set it all up for you if you go into one of your banks branches.

Banks have generally stopped operating their own BBS type access systems. Connect to an internet service provider and access the web site of the bank.

Log in to your bank's web site. FixYa has no access to your private financial data.

Which version of Windows are you using?

Which web-browser are you using? (Firefox? Chrome? Safari? IE9-beta?)

Which version of the web-browser? (Click "help", and click "about")

What web-site are you trying to access? (Bank? PayPal? eBay?)

this is a problem solving site, but you will need to contact your bank to sort this out, and I wouldnt suggest posting your credit card numbers on a public web site such as this.

Fix Internet Explorer issues to make IE fast safe and stable

You just need to access the router setup page and when you're already on the router setup page, just look for MTU and set it to manual and set the size to 1400 don't forget to save the settings after changing that and try again to access the banking web site and that should be working fine already.....