When you click on "Accounting & Finance" tab, there will be "Add New" drop-down menu on the top left corner of the screen. Please select the "Sales Quote" from "Add New" menu and you will be directed to the new blank sales quote form. You can either copy from the existing sales quote or create new sales quote from a blank template.
Please fill the following required fields:

Client
Address
Currency
Quote Date
Valid Until

Once you've filled those required fields, you are free to use other optional fields, such as Shipping Method or Related Project.
Also, you will be asked about the Product/Service, you can give a description and set a discount, tax rates.
You can add or remove multiple products and service by clicking "+" or "-" sign.

Additionally, at the bottom of the line, there is a "Add multiple lines" button where you can perform the same operation.
You are free to write down or copy and paste the sales terms and condition in "Term and Conditions" text box.
Great! Sales quote is Ready!

Now you can either download the .pdf version by clicking "PDF Version" button or approve and save it.
If you click on "Approve and Send to Client" button, system will bring up the pop-up window from where you will be able to send an email notification about the sales quote. It will automatically include the PDF version of the file in it.