I’m very new to using Linux as a daily driver (and even newer to troubleshooting it) and am experiencing issues setting up one of my internal drives as dedicated storage for Steam. I formatted it as ext4 using the partition manager when booting from USB and am able to mount it in Dolphin, but only have read permissions.
Not sure what information to include here to start off; Any help is greatly appreciated.
Then the access permissions do not match.
Can you show the permissions for that drive and mount point ?
you will need to take ownership of the device. Since you formatted it over to ext4 it belongs to root.
sudo chown -R $USERNAME .
On the forum there is an article [1] with the nitty and gritty of mounting internal and external disks.
Also check the discussion below the article though.
[1] [Tutorial] How to Permanently Mount External/Internal Drives in Linux
Oh, and welcome @zetsubou - keep trying and keep learning; that’s how you make your OS and your system your own 
Welcome @zetsubou! The replies above are good, but as a newbie this link might also be helpful as another general, easy-to-follow tutorial in what you’re trying to do…
You’re off to a great start.
p.s. - BTW, in order to use the command line chown to change ownership of something that is currently owned by root, you must prefix the command with sudo (and enter your password), as shown by @thefrog above, or use su to change your prompt to # (instead of $).
In other words, you have to be a superuser to change ownership of something belonging to the superuser. 
Thank you @SemLraug and @ArchieLinux , both of these got it working.
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