Yesware will automatically log the Activity Type with the default value selected in your Salesforce environment. To control which values correlate to Yesware-specific tasks, you can either change the default value of the Activity Type (to change this setting, your Salesforce Admin will want to go the Salesforce > Setup > Customize > Activities > Task Fields > Activity Type and uncheck any default for Call), or employ a workflow rule/field update that looks for Yesware-specific tasks and automatically adjusts the Activity Type value based on your preferences.