Thank you for your question, @dimaievlev!

1. You may add a tag when you add or edit a task by tapping 'Edit more' - 'tags' - new tag.
2. Deleting a tag can now be operated but only on web version: https://i.doit.im/home/#/settings/tag

If further questions, please feel free to contact us.
Nice day!

There are two other shortcomings:
- Unable to edit tags.
- Also different order of tags in the desktop version and in the android application.
Say something?

@Ihor_A Thank you for your question!
1. We'll add the tag editing feature in the following phone versions, and for the web version and desktop version, later when the these versions are developed based on the new design.
2. As for different orders, we've been adjusting them.

If any further questions, please feel free to contact us.
Have a nice day!

Thank you! I'm looking forward to the new version for Android!
For now, I asked for a beta via facebook message. If I have suggestions, I will write.

@Ihor_A Okey, thank you! We'll send you test invitation.
Have a nice day!