Hi,

Please follow the below steps.

Note: It is not possible to seize FSMO roles using the graphical interface. So use below commands.

1. Open an elevated command prompt on a working DC, type ntdsutil.
2. Type roles.
3. Type connection.
4. Type connect to server <DC_name>, where <DC_name> is the name of the DC that will inherit the role.
5. Type quit once.
6. Type one of the following, depending on the role being seized:
   1. PDC Emulator: seize pdc
   2. Infrastructure Master: seize infrastructure master
   3. RID Master: seize rid master
   4. Domain Naming Master: seize naming master
   5. Schema Master: seize schema master
7. Confirm that you wish to seize the role. There will be a considerable amount of output. The last line should indicate that the role has been seized.
8. Type quit until you have exited Ntdsutil.

Use http://www.experts-adda.com/questions.php?id=72 URL to check FSMO Role status.

Ref: https://support.microsoft.com/en-us/help/255504/using-ntdsutil-exe-to-transfer-or-seize-fsmo-roles-to-a-domain-control

Thanks, Santosh for detailed Steps.