WordPress Admin white page issue.

Hello, I have a simple issue which i don't have a time to fix it right now, the main problem happen while i did have that issue when we trying to upload a big picture on the website which wasn't allowed because the size was too big, hence we did increase the value for that from [login to view URL] server and then uploaded the picture successfully... after that we were unable to open the admin page because it's show us a blank page (white page)... Now i need to change the website address from [login to view URL] to [login to view URL] and fix the wp-admin also be sure that all the plugins/theme editing is working on the new WordPress installation. This should be done today with the next few hours.. if that going to take with you more than this please let others professional do it! Only WordPress Expert bidding!