You can always donate here (https://www.paypal.com/donate/?hosted_button_id=PRCJU68ULJ5J8).
If you would like to donate to a specific Mandir/mandal, visit their specific site:
Maryland (https://haridhammd.org/donate)
New Jersey (https://nj.hsapss.org/donate)
Ohio (https://www.paypal.com/donate/?hosted_button_id=JPPANB5GHAD7Q)
Illinois (https://ydschicago.org/donate)