I found this guide: https://support.wix.com/en/article/corvid-tutorial-creating-previous-and-next-buttons-for-a-dynamic-item-page-with-code
But since it's not specific for blog posts, I'm having trouble understanding it.
If there isn't a guide out there I probably won't bother until this feature is finally added to Wix blogs lol.
it's great you have an interest in using Wix Corvid to customise your Blog.
This is a link explaining how to add 'show more button' on a repeater, but you can also add pagination or next/prev buttons in a similar way:
This is the dedicated Corvid community forum, where developers can ask questions and get info, feel free to use it to get answers: https://www.wix.com/corvid/forum
Also, check it out many other customisation options the Blog integration with Corvid provides: https://www.wix.com/wix-lp/corvid-blogs