Can you please help me with how to apply discounts to my inoices and sales. The option on the helpdesk is not working?

Hi there, klattsng-gmail-c.

I'd be glad to help you help set up discounts and use them in your invoices and sales receipts. Here's how:

1. Go to the Gear icon and select Account and Settings.
2. Proceed to the Sales tab and look for Sales form content.
3. Turn on the Discount feature. 
4. Click Save, then click Done.

Once done, create a discount item in your Products and Services List. Here's how: 

1. Click the Gear icon and select Products and Services under Lists.
2. Click New and select Non-inventory or Service for the type.
3. Enter a unique name of the discount.
4. Select a category. This should be the item you are selling and giving a discount.
5. In the Sales price/rate field, enter the discount as a negative amount.
6. From the Income account drop-down menu, select the Discount given account.
7. From the Sales tax category drop-down menu, select Nontaxable.
8. Click Save and close.

After that, go to the discount section of the transaction just below Subtotal. Then select if you want a percent a value. Here's an article about this for more details: Add A Discount To An Invoice Or Sales Receipt In QuickBooks Online.

Let me know if you need anything else.