That large quotation mark is among all the text options you can select when editing a blog – it's on the third row. You can enter any text after it and adjust the word size as usual.
How To Make Quotes On Blogs?

wait can you please screenshot where on the blog editiding place it is?
It may not be available to everyone.

wait can you please screenshot where on the blog editiding place it is?
It may not be available to everyone.
what? why not is it a special top blogger perk?

its not avalible to everybody so you have to make your blog in a club news announcement, where it is avalible for some reason, then you copy and paste the news into your blog
For some reason you can only copy and paste stuff as a prenium member, so you cant do this without membership
so yeah, I was reading some blogs and they always have big green quotation marks, and I can't highlight them. So are they an image? are they text? or are they a special tool you can use here? Example in this post
how do you get that quotation mark? normal looks like this "