Hi Karla ,
There many ways you can help Khan Academy and make others aware about Khan Academy in Mexico this following article has a few ideas
https://khanacademy.zendesk.com/hc/en-us/articles/202655884-How-can-I-help-volunteer-regularly-

Also you can be a Language Advocate and translate content from English to Spanish the following article explains how to apply.
https://khanacademy.zendesk.com/hc/en-us/articles/226412368-Applying

I hope this helps answer your Questions should You have any more questions I will be happy to help.

Remember the best way to help bring Khan Academy to your community is advocation through Social Media, Telling friends and family this will get word out about the missions,values and goals Khan Academy has.