Survarium player M4rk0 has recorded a handy video explaining the process of logging in with your web browser instead of your Steam overlay, yet still having access to both!
The good thing about this is that when you login once using the method explained, you will be able to access game's website & forum with a login status for (24h). Without the need of launching the game every time you want to check the forum.
Video link : https://youtu.be/Rwk9Wpn2l4k