Currently, the "get involved" page sends people to Phabricator without any further comments. This was very confusing for me because Phabricator doesn't offer you any way to create a new account. With six members in the project, the impression is that participation is limited to these six members and everybody else has read-only access.
This change adds a note pointing people to KDE Identity site for account creation, this should be enough to get them started. While at it, I also fixed a typo in the same sentence ("checkout" => "check out").