Wux Blog is an app and not part of Wix Corvid, if you want more help with the Wix Blog app then please post on their own forum, read their own Wix Support pages or contact Wix Support themselves.
https://support.wix.com/en/article/adding-html-code-to-posts-in-the-new-wix-blog
(Optional) Customize the element you added:
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Click the Width icon and drag the slider to select a width.
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Click the Height icon and drag the slider to select a height.
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Select an alignment: left, right, or center.
Wox Blog Forum
https://www.wix-blog-community.com/blog
Wix Blog Support Pages
https://support.wix.com/en/new-wix-blog/setting-up-the-new-wix-blog
Wix Support
https://support.wix.com/en/about-wix/contacting-wix-support