On the dashboard select "New Creative".

On the "New Creative" screen you can now choose the name, size and template.

Type the name you want to use for your Creative. You can change the name later on the Dashboard.

Choose the Banner size by selecting one of the IAB Standard formats from the list or select "Custom width/heigth" to freely define any custom size.

Now select what kind of Creative you want to build.

Choose "SmartBuilder" to get a list of SmartBuilder formats. These are optimized to be very fast and easy to use.

Now select the template you want to use for your Creative.
Some templates (e.g. Image FX) include multiple formats which you can choose in the SmartBuilder.

Click "Studio Template" to open the PrimoStudio Template Gallery.

Use the filters for Creative Format, placement and size to show all available templates for your choice.
By default the filter is set to the Size you have selected in the New Creative screen before.

Click "Copy to Dashboard" to create a copy of the template in your account.
The Creative will then appear on your Dashboard and can be edited in PrimoStudio.

Choose "PrimoStudio" to start with an empty PrimoStudio project.

In PrimoStudio you have full control over all aspects like layout, animation and interaction so you can build your own custom formats from scratch.

The "Build Creative" button leads directly to the SmartBuilder or PrimoStudio editor and creates the selected format.