You have a long way to go mate.
Before being able to add signatures to you profile, you need to be a jr member of the Bitcointalk forum which you can achieve that after having 14 activity with at least one merits.

This question looks somehow because you are yet to browse round the forum for interactions and further guides, you only post in politics and society sections which is not bad, but with your aim of wearing signature, you need to show some level of seriousness through learning and sharing important contents about Bitcoin to earn merits before been able to wear signature.

You can read this thread for more guide because this is what you need as a newbie in this forum.