The system wont let me fix my incorrect phone number.
I'm glad to see you here, @chebatali123. I can share some steps so you can change your phone number in QuickBooks.
To clarify, have you received an error message when attempting to change the incorrect phone number? That information can help me find you a timely solution. Also, let's make sure that you will enter a phone number based on your QuickBooks region. Example: US phone number for US QuickBooks Self-Employed product.
In the meantime, let's use a private browser to fix the phone number. Private mode prevents storing cache and cookies that might cause problems when running websites.
Here are the shortcut keys you can use:
Google Chrome: press Ctrl + Shift + N
Mozilla Firefox and Microsoft Edge: press Ctrl + Shift + P
If this works, go back to your regular browser and clear the cache. This will remove the stored cache or cookies to refresh your browser. If the same thing happens, use another supported browser. It could be that the one you're currently using has a temporary issue with QuickBooks.