Problem with Overallocations

[Carmageddon]

Hello!

I am new to MS Project, trying to learn to use it to manage my own tasks and projects (mostly at work).

I have created a basic set of my current tasks, then assigned one resource (myself), and tried to allocate the timing - but whatever I do, I cant get it to properly "level" the tasks!
I am the only resource, and I dont want to have any tasks concurrently, but those tasks are also not dependant (for example, I need to be able to move the tasks order, and have the timing shift accordingly).

I don't know, am I making any sense?

Here is a screenshot of my problem (there is annoying problem with the forum, requiring 10 posts to link pictures.. so remove the spaces

screencast.com/t/y0PlYDpM

EDIT: attached the file.


Thanks!