just wondering how i can unload materials onto a base

i'm already in the same square as the base and under materials it has a button called Unload Pile 1, do i just click on that to put the materials on the base?

"do i just click on that to put the materials on the base?"

..you mean your asking without even trying first?

The facility you're trying to unload to must have the load limits set to the amount, or higher, of each material you are trying to unload. This can be done in the Building Management section of show stats via the inventory or by going to the buildings control room.

Then all you have to do is dock or be above the top left corner of the facility (might work elsewhere above the facility I just always go there) and click unload, then click where you want to unload it, then enter the amount you want to unload and click the button.

Please also make sure that the facility you're trying to unload the materials into can actually store materials. Not all facilities have that ability.

i didnt want to try incase it unloaded it into space

You can't unload them into space.