the resources interface, baseline and absence.

1.How to make each resource control their own interface?

Each user can change theme (colors) and organization (top right menu)

2.How to identify the baseline days in planning?

Save a base line and display it on the Gantt chart

3.In the absence section telling me to "add some activities on some administrative projects", i don't know how to add these activities?

Create a project with type "Administrative" and add activities on this project.

1) I don't undestrand. Please show screenhsots, exemples, or else to explain.

2) Baseline save all the dates, but displays only planned ones (or real if tasks is started / ended)

3) you're welcome.

1) Project Manager plans activities, name a responsible and assign resources to the activities.
Then resource connect to the tool and see assigned work.
You can do the same for all items, naming the responsible, so the connected resource sees all items (risk, action, activity) he/she is responsible for.
(NB : this is basic of all collaborative tools)

2)Black line is not the baseline, it is the consolidation of sub-items.
For instance, it is the duration of the project from all activities of the project.

3) default display is from current date, just change "start" date' on Gantt planning view or check "show all project".

Reading you questions, I guess you don't have much experience in project management.
I would highly advise you to follow-up some training on the subject.
Project Management is not an easy task, and it's important to understand all the notions before concidering using a tool.