Hi Garett,
You can modify the font size of individual posts in the composer. In your case where you are using EasyBlog's built-in composer, you can just click on the text block and highlight the text that you want to modify, then click on the Size selector at the right and choose the size(http://take.ms/z40rb).
The frontend font-resizer can only resize text, not other elements like images, videos and so on. The font-resizer is for users to adjust the font size on their end in case they are not satisfied with the font. It will not change the real font size of the text in the post.
Hope this clarifies your questions.

Hi, i know that i can resize the font in the composer but in the font composer the default text size is 12 and i would like to make it 14 or 16. Also the default color of the text is a gray color and i would also like to change the default.

I understand the text resizer is for frontend use and just for readability preference for user but it still doesn't seem to work properly on some articles. It seems that if the article has a quote block or photos the frontend text resizer doesn't work. If the article just has text then it works just fine.

Also i tried to change the color of the text in one of the quote blocks and the composer confirms that i changed it but no changes are made on the frontend.

Hey Garrett,
Unfortunately, it is not possible to change the default font attributes in the composer. So you would have to do this manually in each post and block.
You can use custom css to define a fixed attribute for fonts, but then if you do this you cannot select different values for different fonts, and it will render the font-resizer useless since you have fixed the size.

It seems that if the article has a quote block or photos the frontend text resizer doesn't work.

I am able to replicate this issue locally. Thanks for reporting. I will make a report on our tracker so that the developers can take a look at this and see what can be done.

Also i tried to change the color of the text in one of the quote blocks and the composer confirms that i changed it but no changes are made on the frontend.

I have tested this in your post and it seems to be working fine. You can check the first featured post on your site and see that the last quote has the color applied. I believe the reason you could not get it to work is that you have to highlight the text that you want to modify first, then only select the color.
If you just click on the block but did not highlight the text, then you are not considered editing the font style for the text.

Hello Garrett,

Thanks for updating and glad that your issues are resolved now