The only place I can see to make a link to the Inkscape website, would be the first items in the Beginner, Intermediate, and Advanced blocks. (I'm pretty sure they put those tutorials on the website, although they aren't interactive on the website, like they are in Inkscape itself.) (example -
https://inkscape.org/en/doc/tutorials/basic/tutorial-basic.html) Otherwise, the website isn't mentioned on that page.
In a couple of months, this forum will be essentially closing, when a new forum on the Inkscape website will open! Although that page will remain online, and linked to the new forum.
Another option would be to allow the portal on that page, which has the Links block, which has a link to the website. But the page is already so text-heavy! Adding the portal would be a nightmare visually, I think. Maybe I could just put an Inkscape logo on that page? I guess that would be the easiest way. I'm open to suggestions
Hhmm, spellcheck.... I don't think.... Could that possibly be a spellcheck on your browser? Or maybe you compose your messages in a different program? I've never enabled the forum's spellcheck.
If it looks to you like it's part of the forum, could you show me a screenshot? I don't see anything about it myself - I mean in the message editor.