Look at the peaks to first determine if you can assign them. Click on number at the top of each peak to see some information about it. For the structure of the compound and the ions click in the upper-right area of the spectrum.
Identify the compound which gives the mass spectrum shown below?
Compare the two spectra and note the common characteristics. How are the structures related?
More information about mass spectrometry is found at JEOL and Scidex