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It means that you just have to copy the given line:

from sage.rings.polynomial.toy_buchberger import spol

in the Sage command line or in the notebook, and then the spol() function becomes available for the rest of your computation. The fact that not everything is imported by default to save memory and to accelerate startup.

If you get an error after typing such a line, then there is a problem with your Sage installation, please report it by giving an example of what you typed, your Sage version, which binary you downloaded, which machine and OS you used.