You need to submit the postal ballot form duly signed by the elector and post it at the earliest opportunity.
How to vote in utter Pradesh election through postal ballot
The postal ballots are sent through AIR. This is a 3-step process.
The voters have to send their applications for postal ballot and
then the Election Commission sends the ballot papers and
lastly the voter has to post back their filled in paper to ECI for counting.
Postal Ballot Facility in Uttar Pradesh election
The EC had earlier ordered that a postal ballot facility be set up in each constituency.

How to vote in upcoming polls if someone is Covid positive?
There is no need to worry, as the state government has already made
arrangements for those who are Covid positive.
Such people can go to any polling booth and cast their vote by means
of an affidavit ballot paper. They should also carry a document
which certifies that they are Covid positive and take it along with them to the polling booth.
Postal ballot voting procedure in India.
A postal vote is the voting of an individual via postal mail.
The ballot paper is posted to the voter where they can complete
their vote and send it back to be counted by election officials.
An absentee ballot is a kind of postal vote which is usually cast
when the elector cannot attend for example due to work
or study commitments, or in some cases because they are too ill.

There are how many methods to cast vote in India explain all in detail
There are 7 ways to cast vote in India. 1. Polling station: –
One need to go to polling station and cast vote. 2. Postal ballot: –
One needs to fill the application form and submit it before the date of the election
3.Proxy: – proxy can be used as per rules and regulations
4. Overseas: – Voter can apply for an overseas voting card and cast their vote from abroad
5. Model Constituency: -One can vote through a model constituency by completing an application form and submitting it before the date of election
6. E-postal ballot: – One needs to fill the online application form available on official website of ECI
7. Special voting right: – Persons below 18
How to check my voting booth in India?
There is no facility to check your voting booth in India.
You can vote either at any of the polling booths or you can
go to the police station that has jurisdiction over your
polling booth and find out which booth you need to vote at.
How to know my ward no for voting in India?
The use of postal ballot facility in the recent general elections
to Uttar Pradesh 341 seats has increased the value of this system.
The Indian postal service has performed well in delivering these ballots on time.
There is also the possibility that this may enable people
who cannot vote on polling day to cast their ballot by post.