Can we choose the period (I mean dates, for example 30/01-14/02), for which we want to pay, manually?

Thanks for posting in the Community, @katerina-dorokho. 

Currently, you're only able to change a Pay period ending date (14/02/2020) in the program. Once changed, the Pay period starting date automatically populates from the Pay Run window. The screenshot below serves as your visual guide. 

I know how beneficial it is to choose the pay period (30/01/2020-14/02/2020) you'd like to add in the pay run. With this, I'll take note of your suggestion. This way, I can submit this to our product engineers. They can consider your feedback for future product updates.

I recommend visiting this website: QuickBooks Resource Center. Then, go to the Editor's picks section and enter your First Name and Email under the Help Your Business Thrive, Sign up for our newsletter box. After that, click Subscribe so you'll get the latest news and product insights to your inbox. 

Once the pay run is created, click Finalise Pay Run. You can also select an employee and go to the Actions column. This lets you add adjustments to an employee’s earnings. For more details, check out this article: Pay Run - Setup and Processing. 

I'll be right here to help if you need further assistance. Have a great rest of your day, @katerina-dorokho.