how to i add extra from the guide?

i have 14 strips to add to mine, and the build uses 12, which is 2 sets of 6,
as per the pic its
3 then 3 then other side 3 then 3
do i just do 4 then 3 then other side 4 and 3 ? or 4 and 4 and 3 and 3 ... does it matter? like add the extra strip onto the end where the row ends ? no different wireing ? the driver will know whats going on i guess??

Yes, follow the pattern, 4 and 3 to one then 4 and 3 to the other then you will have 2 lots of 7 strips in parallel