Sometimes you will need your project number (or Project ID) when asked by support for one. Most ppl in the helpdesk or elsewhere can only access your projects by having a project number.
There are 2 places to find it.
In your main work area in the studio, bottom left. See the image below. if you need to copy and paste it, just left click on it one time, that will copy it (no need to right click and pick copy), then you left click and pick paste (or CTRL V), to pass it on to who needed it.
It is also available from the drop down menu under Project. See the image below. Same thing applies here as well, left click on the number and that will copy it and then just paste it where you need it to go.