Adding a button link to a Portfolio Item

Hi There – loving the theme but i am a bit new to all this!

I am adding a new portfolio item but the text is not like the WYSIWIG style of the rest of the sit so i am trying to work it out.

How do i add in a link to this button in my portfolio item?

[boc_spacing height="30px"][boc_button btn_content="Visit Site" target="_self" size="btn_small" color="btn_theme_color" btn_style="btn_normal_style" border_radius="btn_rounded" icon_pos="icon_pos_after" icon_effect="btn_icon_anim_out" icon="icon icon-external-link"][/vc_column][/vc_row]

Thanks for your help.