You can use an image pasteboard service like the following, for example; return and paste the URL here as per the following example:
https://forum.manjaro.org
This allows others to easily select, copy and paste the URL, if they wish.
Though, the preference is that you post logs, code or any command output as pre-formatted text, either using the </> button in the Compose window, or manually creating two rows of (3) backticks, and pasting the text in the row between them;
```
Paste code or command output here.
```
which produces something like this:
Paste code or command output here.
Once you have engaged with the forum a little longer than five minutes (speaking figuratively) your privileges will increase as a matter of course.
The Keychron URL you gave explicitly states that only the following browsers are supported:
- Chrome
- Edge
- Opera
I suggest you try one of these; unfortunately, none are available from the official Manjaro repositories, you will likely need to resort to flatpak or the AUR;
Please follow links in information added and discover how to use the forum. Forum rules are required reading. Additionally, also provide your system information as described (below).
Regards.
What follows is from a standard template.
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.
Note: By virtue of using the Manjaro forum you acknowledge and agree to follow Rules and Guidelines outlined; so, you really should read them:
Required Reading
Highly Recommended
Work with us, not against us
It is important to provide as much actionable information as possible in your first post, rather than simply indicating there is a problem. Please also be prepared to provide output from commands if/when asked.
Simply waiting for others to ask you questions is counter-productive – typically, nobody has a 
at their disposal – and your clear, concise and accurate input is often relied upon in order to help you.
Please help others to make informed suggestions based on information you provide.
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:
Suggested inxi command (use either):
inxi -zv8 |
(short-form) |
inxi --filter --verbosity=8 |
(long-form) |
| inxi man pages | (manual) |
If running `inxi` within a `chroot` environment
- Add
--color=0to the long-form command, or… - Change the short-form command to
inxi -zv8c0