For the trackbacks to be functional in a particular blog, you need to enable the following options on the blog's Form tab:
|•||Enable trackbacks - this option enables displaying of the trackback URL with each blog post and inserting of trackbacks as blog comments|
|•||Allow anonymous comments - trackback comments are in fact anonymous comments, so this option needs to be enabled for the comments to be inserted|
|•||Open comments for - this option defines how long after the insertion of the blog post will inserting of blog comments be possible; trackbacks can also be inserted only within this period|
The Allow comments option must also be enabled on the pinned blog post's Form tab so that the comment can be inserted.