Portfolio Custom Content type?

Hi all,

I’ve installed WordPress on my own server and set about fixing a portfolio. I’ve gone fot the Blask theme that seems to build around a portfolio feature:

https://en.support.wordpress.com/portfolios/

I don’t get how it works. The theme obviously have portfolio support, but I cannot find and portfolio information once I log in. According to the link above, if the Portfolio Custom Content Type is not available (that seems to be the case), you can install it though Settings -> Write, but I cannot find anything related to “custom content types” in the settings/write section.

I’m pretty familiar with PHP and web servers, but not WordPress itself. Can anyone point me in the right direction, please?

Thanks.