if you are unable to donate financially to help palestine, you can donate your time by protesting, boycotting, and putting up posters!
if all you have is your device and internet access, you can put your clicks to good use on arab.org. they use the advertising revenue generated by your clicks to help good causes.
and i would urge those able to spare a few dollars to donate to one or more of the following organizations:
Institute for Middle East Understanding
Palestine Children Relief Fund
Palestinian American Medical Association