As you've discovered already, your Vivaldi Social account and the blog's account on Vivaldi Social are separate. There's no way to control the blog via Vivaldi Social, i.e. all posts you publish on your vivaldi.net blog get shared to Vivaldi Social and there's no way to edit them further.

The handle of the main account is @[email protected]
The blog's handle is @[email protected]

If your main account is on Mastodon Social, I'd recommend following the blog account on Vivaldi Social and promoting it, for example, by adding a link to your account's bio. Also, boost the posts whenever you publish a new blog post and respond to the blog's comments from your main account.

@Zaia I suspect that it is a WordPress thing, which is beyond Vivaldi’s control. Maybe someone else can come up with a workaround?

Many thanks @LonM

The themes available for our blogs have been custom-made for Vivaldi Community blogs by our designer and are not available for other WordPress blogs.

@Andrecon Just select any text (e.g. a subheading) on your blog, right click, and *Copy Link to Highlight. Use that URL at the top of the blog to navigate down to the heading.

My Blog

Thanks for bringing this issue to our attention.

We've fixed it internally and it will go out in the next update. Unfortunately, I don't have an estimate as of now, when that will be.

Thank you for hosting your blog on vivaldi.net! 😀

@ItsGloria I reported that internally to bug tracker for Vivaldi user blog.

For my own note:
CW-2018: "Edit of Widgets shows console errors" - To Do

@医生G thanks a lot, it had been solved.

@DoctorG Ah. Oh well. Bummer.

@jane-n That worked, thank you! 🙂

Unfortunately, iFrame use has been disabled, because some users with not-so-nice intentions could add some sinister content to their blogs.

@mossman Sad to read that the the restriction insufficient for you. I do not know why Vivaldi Blog is so restrictive. Could be to protect against large uploads/resource consumption. As i know a default a WordPress installation has 2 Mbyte upload size.

@essebes Thanks for reporting here. 🏆

@jane-n
Thanks Jane!

OK. A day after the commonAuthId cookie expired, I got signed out. I understand that oauth based login should expire the oauth token fairly quickly, but that should not impact the login session itself. I will file a bug about this.