How do I change the font in my blog without changing the font in the whole site?

I'm trying to add hashtags to my blog post but its entering 'No'. I found a thread saying that the Orpheus Pro font package wont allow it. I really don't want to use any of the other fonts available. Is there anyway around this ? Or alternatively, I bought a font originally, hoping I could upload it but its not accepting it ? Wondering if I could get that uploaded, it would allow me to add hashtags. 

Hi,

Can you share link to blog & which elements you want to change font in blog page?