This seems easy as it is only a barre chord, you simply place your index finger across the first fret. Make sure that the finger presses down on all four strings at the same time and all the notes sound clear. The one problem with this chord is holding the ukulele, it can be awkward to rest it on your middle finger as you play. Maybe try gripping harder with the thumb, whatever is comfortable for you.
Bbm7 (A#m7) Chord details
Type : Seventh (minor)
Intervals :Bb (T), Db (3m), F (5J), Ab (7m),
Formula : 1 b3 5 b7
Alternative notation : 1 1 1 1
Tuning : Standard Tuning (GCEA)
Alternative Bbm7 (A#m7) positions
Sorry, we do not have more positions for this chord.