Open ArcCatalog, navigate to the directory where you store your map documents to be served with ArcGIS Server (<ArcGIS Server location>\ServiceDocuments) and publish the MXD files (SynMapService.mxd, SynPlotService.mxd, SynExtractService.mxd, SynePaperService.mxd) to ArcGIS Server using the ArcGIS Server management connection (ArcGIS Server node) created in the step before:

Publish Map document to ArcGIS Server

Publish wizard - choosing the ArcGIS Server node
Using the publish wizard you can keep all default values and just press Next and finally press Finish.