Looks like you have an Orange T-SIX transmitter. If so, then section 9 of the manual describes the mixes. The "master" channel is the channel you are using now, and the "slave" channel is the one you plug the second servo into. Make sure that the mix is always active, not enabled by a switch. The amount of mixing should be 100%, and the trim option should be set to link to the active channel. I have never used that radio, so can't help much on the subtleties of the setup.
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