Hi,
once the symbol and package are defined you can create a device easily.
Just follow these steps:
Click "device" - "New".
Enter the name of the device. You'll get a question if you want to create a new device. Answer should be "yes".
The pop up window shows you where to enter the device's name. Enter the name and "Enter".
A new window will pop up (completely empty).
Click "Add" and pick the symbol you created.
Place the symbol centered on the 0/0 (X/Y) reference mark.
Next assign a package for the device.
Select the package "HTSSOP28PWP"
Now give the IC a name, either "U" or "IC", whatever you prefer for a device name.
Finally connect pins (out of the symbol) to pads (out of the package).
Save and done!
Boncuk