It's easy to get up to speed with Posterino. If you not already did, watch the Getting Started screen-cast to get an idea of the basic workflow.
The general Posterino workflow looks like this:
Choose a template for your new document
Browse through the list of templates and select the one you like to use for your new document. Adjust the document size and resolution to your needs. Double-click the template to create a new document.
If the template browser window is not visible, choosefrom the menu to open it.
Add images to your document
There are various ways to add images to your document:
Delete empty image frames as needed or adjust the number of images in your document to your needs.
Customize the layout and background of your document (optional)
To customize the layout or background, make sure no image or graphic object is selected (> or Command-D). Now the on the right of the window will show document and background related options.
Customize the images (optional)
To customize the image or graphic objects, select all objects in question. Thewill show graphic object related options. Here you can:
Fine-tune your document using the inspector (optional)
The inspector panels will show all available customization properties of the selected graphic object. If no graphic object is selected, the panel will show the options for the document background.
Click thetoolbar button and choose a way to export or share your document:
Here you can choose to render your Posterino document into an image file you can send to a print shop or you can share your document on Facebook, Twitter etc. Depending on the sharing extensions installed on your Mac.
This is just a general guideline, you don't need to follow this workflow step-by-step. On a minimalistic approach, you just have to pick a template and add images to your document. Just choose what works for you.