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The Icom IC-705 has not been added to the official list of radios supported by WSJT-X. In this video however, I will show you how you can set the radio up to work with WSJT-X and perhaps other digital modes.
As of the date of this video, the latest version of WSJT-X is v2.2.2.
https://physics.princeton.edu/pulsar/K1JT/wsjtx.html
Future releases will no doubt support the IC-705 and when that occurs you will not need to change the CI-V address as per this video however all other settings will still be relevant.