You open up bodyslide, select the curvy preset from the drop menu and you should see your body. Or start over and have Vortex manage Fallout 4 then install Bodyslide, Looks menu and CBBE If you are able to open it but can not see preview and presets, then you need to go to your Vortex map (where all your mods are, NOT fallout data) go to Bodyslide Studio and in there copy 'Tools' into Fallout 4 data map.
The usage of Bodyslide and its inner working is the primary goal of this document. I deleted Bosyslide and reinstalled it after I used LOOT and FO4Edit to see what mods needed cleaning, and then cleaned them following the instructions from the TES5Edit cleaning guide, respectively.
Fallout 4 - Installed bodyslide and CBBE body and try to run bodyslide.