Today I tried installing an extension called simitracking to track my store using my mobile phone. After I copied all the files included into my home/public_html/ as instructed, I tried logging back into magento admin and nothing happened. After inputting my user and password it just showed blank on the screen with this address:
I heard this could be a cookie problem and I tried following instructions here but also to no avail: "https://stackoverflow.com/questions/9075539/cant-login-to-magento-admin"
I tried everything including clearing cookies and using different browsers and it still didn't work. I've also searched through the internet for at least 6 hours yet I'm still lost. There is no problem loading the front end but I cannot access the back end admin pages.
I look forward to anyone's help. Thank you.