One problem per Support topic is usually recommended.
You have not provided near enough information for others to help with that. Please provide your system information as described (below). Also, include in the first post as much actionable information as possible that might help others to identify an issue.
Please see “Highly Recommended” links (also below).
This is also lacking information;
please open a new topic for this issue.
Usually this would be obvious while installing Manjaro;
Your Username and Password (and that of the Super User (root) should be completed in the respective Calamares window (Calamares is the Manjaro installer application).
Regards.
Welcome to the Manjaro community
As a new or infrequent forum user, please take some time to familiarise yourself with Forum requirements, and the many ways to use the forum to your benefit.
To that end, links are provided (below) - Please use them.
Be prepared to provide outputs from various commands when asked. It’s equally important to provide as much actionable information as possible in your first post, rather than simply indicating there is a problem.
Waiting for others to blindly ask questions can be counter-productive – typically, nobody has a 
at their disposal – Instead, please help others to make informed suggestions, based on information you provide.
Update Announcements
The Update Announcements contain important information and a Known Issues and Solutions section that should generally be checked before posting a request for support.
System Information
While information from *-fetch type apps might be fine for someone wishing to buy your computer, for Support purposes it’s better to ask your system directly; 
Output of the inxi command (with appropriate parameters, and formatted according to forum guidelines) will generate information useful for those wishing to help:
inxi --filter --verbosity=8
or the short form (preferred):
inxi -zv8
- inxi man pages (Arch Manual)