@babettey Hi - the Vivaldi blogs use WordPress, a very popular blogging system, maybe the most used on the net. But it can certainly be a daunting experience for beginners trying to learn to use the WP Dashboard for the first time, and managing posts and themes. Vivaldi has tried to keep it simple by removing some of the more complex features so users can get started with blogging relatively easy.
But like everything else, it takes a little learning to put to good use, and a good place to start would be the official guides:
https://wordpress.org/support/category/basic-usage/
https://wordpress.org/support/article/first-steps-with-wordpress/
https://learn.wordpress.org/course/getting-started-with-wordpress-get-familiar/
As for your issue with the dates being the same, I'm assuming you did an export from another platform? And somehow the dates became lost during that process so all dates will be the date you imported the posts.
Depending on how many posts we're talking about, it might be necessary to redo the export, or maybe just simply edit the post date for the imported posts, which can be done directly in the WP quick edit mode:
033f2762-3fa9-4ced-8665-d413a9b8a34c-image.png
Edit the post date and when you're done click Update:
1f0ebe44-bc02-46ca-8354-8cd4d5e4b1f0-image.png
