Tell me how to do programming in qbasic

That would require much more material than would be reasonable on a forum like this. During the transition from DOS to GUI operating systems like Windows there were ten week college courses that were introductions to computer programming using QBasic. Also be aware that the hard copy printing capabilities of QBASIC might be limited under the more recent versions of Microsoft's Windows.

QBasic was designed for an OS that utilized a video screen in a manner that emulated a hard copy printer/terminal. A GUI programming language like Visual Basic might be more relevant to the current GUI operating systems.As a bonus you may be able to acquire a book from a major retailer that combines printed instruction with a CD-ROM containing an introductory edition of the Visual Basic programming language.

Also note that there are already QBasic tutorials on the web. I haven't reviewed any of them to compare their effectiveness, but a Google search for "QBasic tutorials" qbasic tutorial - Google Search produces multiple pages of links to sites with tutorials.