The questions are to be asked in relation to the Bible texts read in Requirement 2a. The point of having the Pathfinder answer these questions is to encourage him think about the text in a way that he may not have before. It is easier than we like to admit to read a long passage and not even think about it. Journaling should help prevent this.
How the journaling is done should be left to the Pathfinder.
Writing
Some people are more comfortable writing things down. This can be done with a pencil (or pen) and paper in a notebook, in a diary, on a word processor, or even on a blog or social network posting.
Drawing
Some children do not like to write and will resist it mightily. For such children, the thought of not being invested in not likely to be an effective motivator. They may prefer to illustrate the concepts instead, and that is a valid way for them to journal their thoughts.
Electronic Process
The Pathfinder may choose to write his journal entries in a word processor, a blog, or a social network. While these may be considered either writing or an "electronic process," there are other options available. For instance, Pathfinders may wish to make an audio or video recording of their thoughts. If they have the equipment, this should be encouraged. If they are not comfortable sharing the material with the club, do not force them to.