Ok, So I am going to show you How to make a Non-Animated Stamp On mac, Because i had to figure that out myself and that was a pain. It's very simple though and you can make one in under 10 minutes that is if your computer is working right !
I apologize if this is complicated or confusing this is my first Blog/Tutorial :D.


Step 1) Download Seashore : Download it here !

Step 2) Get a stamp border Here And download it

Step 3) Open Seashore And drag your stamp border on it so that it makes a new layer (Optional)

Step 4) Decorate , maybe By adding Typing Click the "T" Type tool. Type, change size and font * Tip: Place the Typing And then go over it once And blend the extra colors into the background by using sample tool and clicking the background* Another tip: When Typing, Add A new Layer And type on that P.S. Color You are using must be the foreground Color.
Or You can add Pictures, Easiest To add Are pictures from the internet with transperent backgrounds *Hint: To Make the picture smaller, Click the move tool And place the "Scale layer or floating Selection (Shift)" Modifier*

Step 5) Save it by going to File>Save as Or Shift,Command,S At the same time Make sure you save it as a JPEG File and not a GIMP File.

Step 6) Right Click it and open it with Iphoto By Going To other And clicking Iphoto

Step 7) Go To edit, And crop it to the preferred size then drag the finished stamp to your Desktop

Step 8) Tweet It, And right click the link on your tweet Then click " Copy image adress" 

Step 9) Open Your PMC Profile, Click the little picture and paste the copied image address into "Source"