Kili Technology allows to easily position points. Just click on the category of the object you want to identify, then click to annotate. You can terminate by clicking cancel, or "Esc".
It is also always possible to change the class of an annotation with a left click, selecting "Change class", and then select the new class of the object. If the task is multi-classification, this operation will allow you to select all the categories for this annotation : you can delete the previous class but also just add one or more others.
Point can be nested (see nested classification)) with all classification tasks, to build refined object classification.