How can i set mcs

i want to fix my mcs to 15 and 14. how can i do that

You really can't/shouldn't -- the MCS rate is dynamically determined based on the SNR/BER of the link, as well as falling back when the link is not in use.

If you're interested in the technical details, read and/or search "Minstrel HT rate control"

See also

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Are there any drivers supporting a fixed mcs (for experimental use)?