Mendelssohn's 'Duetto' (Op. 38 No. 6) - pedaling??

[ttysonr]

Hi everyone, first time poster here hoping to get a little help because I'm not taking lessons at the moment. I'm learning Mendelssohn's 'Duetto', one of my favourite pieces, and struggling to figure out how to pedal it. I'm sure that certain notes in the upper voice should be sustained, but I can't get the technique right. Does anyone have any advice on how to pedal this piece? There are no pedaling notations in the music, so any help would be hugely appreciated. Thanks so much!

T