I need help with my pen in Krita. I just downloaded Krita and when i went to go use the brushes they all came out uneven and blobby. How can I fix this?

If you're on Windows, try Settings > Configure Krita > Tablet Settings, change the tablet API from Wintab to Windows 8+ Pointer Input (Winink), make sure you pressed the OK button and then restart Krita. If that doesn't work, have a look at the suggestions in the manual:
https://docs.krita.org/en/contributors_ ... -solutions
https://docs.krita.org/en/user_manual/d ... ng-windows

Is it like the problem in this post: viewtopic.php?f=139&t=162340 ? (YouTube video link in the post.)

Which operating system are you using? I assume you've just downloaded and installed krita 4.2.6?

Which graphics tablet are you using? Have you checked the maker's website for an updated driver? Have you tried reinstalling the tablet driver?

As suggested by Snudl in the linked post, can you try switching the tablet API to see if it makes a difference?
(Oh, Snudl got in before me )

Can you post a link to a full screenshot showing the problem?