Others have answer you the question, so I just proceed with the second question.
I use the all in one seo plugin for my wordpress website! How to add keywords for my post?
If you tend to use the tool, there are 2 methods to insert keywords to title tag section.
- Global setting > go to plugin setting
%post_title% | AWEPay Online Merchant (The output Post Title + AWEPay Online Merchant)
%page_title% | Payment Gateway Europe (The output Page Title + AWEPay Payment Gateway Europe)
You can play around the query with %date%, %blog_title%, %description%, %post_title% and mixture with the targeted keywords. If you still not clear, you can refer to awepay.com
- Individual post setting > go to post edit
This setting overwrite the global setting, it allow you to out different title and description tag.