How can I edit a Title that is already classified as a "Video" into a "TV Series" ?

Answered in your other thread, but here are the step-by-step instructions:

Go to the title's page at http://www.imdb.com/title/tt3394028/ and click "Edit page".

On the next screen, on the Title Correction line (fourth line from the end), select "Add correction". Click "Continue".

On the next screen, there will be a blank line on which to enter the corrected title. Enter it as:
"The Sasha Marina Show" (2013)

In the Explanation box, explain that the title is actually a webseries rather than a single made-for-video program, and if you have any links to prove that, provide them. Click "Check these updates".

On the next screen, you will get a warning that says, "There is a mismatch between the title type of the old and new titles. Are you certain that you wanted to change the type of the title as well as its spelling? Please see IMDb's guidelines on title formats if you are not sure." That's what you want, so check the box marked "Warning understood, go ahead anyway." Click "Re-check these updates".

On the next screen, your data should appear with a green background, and you should be able to click "Submit these updates".

Good luck!