How to upargrade guild hall on 4 lvl???
Are you asking how do you upgrade a guild Hall to level 4? If you are then as a guild you need to complete Guild Crests. Each one gives exp in varying amounts depending on the cost of completing the quest. Once your guild has accumulated enough exp the guild hall will increase in level. From memory about 221k exp is required to get it from level 3 to level 4.
Hope that answers your question. If it has not, please confirm exactly what it is you are wanting to know.
Iron Fortress: 377m