Adding a new content item into the list of available values

Summary

Adding a new content item into the list of available values

Content

Hi - I have created a new profile/content item called Secondments so that people can log when they have been on secondment to other areas of the business, how long they were there, what they learnt and what was the business benefit. However, I can't seem to get this pulling through onto the list of available content items for the user to select. I'm guessing that I'm missing a vital step in order for this to appear. Can someone help?

I have attached a screenshot to help show which area I am referring to.