The recall queue is deceptively simple: cards due today are on your dashboard. Click each one, attempt the answer in your head, flip, rate.
The single most important habit: do it daily. Missing a day is fine; missing a week means your intervals collapse and cards you'd nearly mastered come back as beginners.
The second most important habit: rate honestly. If you almost got it but not quite, use 'Hard.' If you were guessing and lucked out, use 'Again.' The scheduling is only useful if the ratings are true.
The third: set confidence honestly. Confidence-tagging is what turns your recall reviews into calibration data. Guessed and got it right? Confidence 1. Knew it cold? Confidence 5. Anything else is somewhere in between.