You can find someones profile by clicking on the first letter of their username then selecting their name from the list

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halojones
Han
Havoc
hayley
head-republic
head2head
Heather
hedonist
Helen
help
Henrietta Wimmer
heny
hipflip
HippyChik
hi_its_katy
Hoggy
holly_anderson21
holmes
holz
hongjinjing
Hoppy_Toad
hotzelldog
howlingwolf
howtosavealife
HpFan
huiru
HunnieBunnie
Hunty