Simple change on WordPress theme

Hello guys, how are you?
I have a medical Arabic website, but I want to make a simple change, which makes my font is Bold.

see: my fonts:
[​IMG]


1- But I want like this:
http://ift.tt/25IvIWU

see one of my posts:
http://ift.tt/1Utpbnq

I am using Customizr WordPress theme

2- I want too make the H2 smaller

from HTML & Website Design http://ift.tt/25Iw1RB
via IFTTT
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