Hello, Alexander Mikhalenko, and welcome to the Simple English Wiktionary!
We hope you will be happy editing here. Some helpful pages to begin with are Wiktionary:Community Portal, Wiktionary:Useful, Help:Contents, Wiktionary:Rules, Wiktionary:How to change a page, and Help:Creating a new entry.
If you want to talk with other members or ask a question, you can visit Wiktionary:Simple talk. Administrators can also help you with more difficult problems. You can also ask me for help. The best way to do that is to leave a message on my talk page. Just remember to sign your messages on talk pages by typing "~~~~" (four tildes) at the end of your words.