Using basic laws.
1) A country exists if there's law and order.
2) An army can only fight a war against another army or an armed group.

Using these two basic laws, Biafrans can create Biafra by collapsing Nigerian authority in Biafra land.

How can this be done?

Do you remember how Berlin wall fell?

Pick a two weeks period for this to happen.
Stockpile canned food and water.
Mobilize the people stating clearing the plan and intensions.

If every man and woman in Biafra come out in a day at same hour and move round the cities and towns, Biafra will be created.
As they match in millions at same time across Biafra, every symbol of Nigeria will be removed and replaced with Biafra symbols.
Police stations will be ransacked and every Nigeria police man asked to go home.
Every army barrack will be ransacked and the army asked to go home.

If every Nigeria symbol is removed from Biafra by civilians, Nigerian government will lose control of Biafra.

There is as many unharmed civilians you can shoot at and you'll give up.

Noted, spread the news.

We are determined We are fearless We are resolute We are IPOB We are Biafrans