Hello @kallepe!
1.)Unfortunately, there is currently no option in the customizer to change the Blog section title. I hope we will add it to the next theme update (I put it on the TODO list).
Until then, you can Change the Title in the following way:
1. Open theme editor. (Go to Dashboard->Appearence->Editor)
2. On the right side, in the “Includes” folder find the frontpage-blog.php, and click on it to edit it.
3. On the line # 11 replace the ?latest from the blog? text.
4. click on the “Update File” button to save the changes.
https://prnt.sc/kko6cs
2.) It’s not possible to do that on the blog homepage.
To Add the content on your Homepage, You need to make your Front Page a Static, following next steps:
Step 1: Create a FrontPage,
Create a new page. (On the left sidebar in your WordPress Dashboard go to Pages ->Add new)
Title it “Home”(or whatever you want to call it..), and add a content to your page.
Click on “Publish” button to save and publish your Homepage.
Step 2:
Go to: Customizing->General->Static Front Page
Check the radio button next to ” A static page”.
In the “Homepage ” drop-down menu, select your “Home” page, to display on your Homepage.
Step 3: (Optional)
Select a Blog Page, (If you want your WordPress website’s blog function to work)
In “Post Page ” drop-down menu you can select any previously published pages, to display as your post page.
…or you can create a new one by clicking on ” Add New Page ” link below “Post Page” drop-down menu.
If you do not need a post page, leave the field blank.
Step 4:
Click on “Publish” button to save your settings.
https://prnt.sc/kkobmi
Best Regards