how update in sparql

Question

In my n3 data in rdf, i have the following data, and i want to change a little bit. I have the value 'no' and i want to change that value to 'yes'

house:a1 a stand:Map;
    house:id "1"^^xsd:integer;
    house:sell "no";

I want to select that value 'sell? and change then, that is why i do the select

select ?sell where { 
   ?s stand:sell ?sell.

i want to delete tha value "no" and change to "yes" but i dont know how to do it, but i dont know how to do it.