Go to the post you want to edit
Select edit post
Make the changes to the post, and select update.
It is worth noting that if your blog is an academic work, and people may have referenced it, you can highlight any changes you have made in a non destructive way.
If you want to alter text you can highlight it and mark it as “Strikethrough” so the original text is still present.
If you want to alter text you can highlight it and mark it as “Strikethrough” so the original text is still present. (updated 17-3-2021)