Here is how you can add items to inventory:

Step 1: Click on menu on the upper left corner of the screen

Step 2: Click on Inventory management

Step 3: Click on the (+) icon at the bottom of the screen

Step 4: Click on Add item

Step 5: Enter item name, choose category, choose the measure of selling (Units/Fraction), enter selling price, and click on the coloured circle to add shape/colours/Image.

Step 6: Click on Save

Note: 

To add variants to item, click on 'Advance' and then enter variant details.