I have set up an Transactional Replication in SQL Server 2012 and it works fine (update after some seconds) But is it possible to edit my replication to trigger only if i "push a button for" and not automatically?
When you setup Transactional Replication and create subscriptions you can synchronize subscriptions:
This is covered in Synchronize Data.
It sounds like you have configured your subscription to either synchronize continuously or on a schedule.
If you would like to synchronize your subscription on demand, i.e., by pushing a button, you can do this a couple of different ways which are covered in Synchronize a Push Subscription and Synchronize a Pull Subscription:
Both of the links above provide descriptions and examples of each approach. The quickest way to synchronize on demand by pushing a button is via SQL Server Management Studio. Right-click your subscription you want to synchronize on demand and click View Synchronization Status. Then click Start.