unable to insert hyperlink in post

You create a link by adding the hyperlink code around the text. Example –

<a href="http://add_link_here.com">Your text goes here</a>

I can actually see the code from the site itself (Page Source Code) without needing to login. It’s showing up correctly, but the color is white and you have your background set as white which means it can’t be seen. You can add or change the code like this –

.epik-blue .welcome a {
    color: #333;
}

The code is already in your css, but it’s bundled with other code. You can split it up or add the code above to change it.

The line that it’s coming from is line 2857 in your css –

.epik-blue .head-wrap a,
.epik-blue .welcome a,
.epik-blue .home-feature-bg-dark a,
.epik-blue .author-box a,
.epik-blue .footer-widgets a {
	color: #fff;
}

But you could add that code above and it would fix it as well.

Yes it’s supposed to do that normally for links. But you can change the font-weight like this –

font-weight: 300;