As commented by @Michael Stimson, if the point data in text format or CSV format you need to import them into QGIS. To do that, here is the process:
- Import them using Add Delimited Text Layer
- Choose the correct delimiter, X Field and Y Field
- Save the file as shapefile and choose the correct CRS that matches the polygon shapefile
- Now, there are different methods to extract polygon attribute into the point shapefile:
a. Using Intersect
tool from Vector -> Geoprocessing tools -> intersect
b. Using Add polygon attributes to points tools from SAGA -> Vector point tools -> Add polygon attributes to points
c. Using Join attributes by location
from Vector -> Data Management tools -> Join attributes by location
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