How do I shedule image effects?

Under the tonemaper documentation it says the following:

Tonemapping works well in conjunction with the HDR-enabled Bloom image effect. Make sure that Bloom should be applied before Tonemapping as otherwise all high ranges will be lost. Generally, any effect that can benefit from higher luminances should be scheduled before the Tonemapper (one more example being the Depth of Field image effect).

What does that mean? I must drag the bloom script on the camera before the tonemapper script or how does this work?

Yes, the image effects are processed in the order in which they are added to the camera.
See for example this question and
the documentation (which admittedly only says that multiple scripts are processed sequentially).