In days of yore, people had to send me a photo if they wanted a custom thumbnail to highlight their Builder's Journal. I would then have to tweak it and put it through a stupid number of machinations to get it to maybe show up correctly if the software wasn't grumpy that day. Since switching to the new forum software, I found a add-on that allows the person who started the thread to click on their thumbnail and upload whatever (appropriate) photo of their project they want. Enjoy!
How to add/change the thumbnail for your Builder's Journal:
When logged in, if you hover over the top right corner of your thumbnail (ie, the photo or graphic immediately to the left of your Journal thread) you should see an icon for a pencil which allows you to edit the photo. Click on it and then either select a photo from the gallery of your photos if it shows any or just upload a new photo using the upload button. It's easy like Sunday Morning.
How to add/change the thumbnail for your Builder's Journal:
When logged in, if you hover over the top right corner of your thumbnail (ie, the photo or graphic immediately to the left of your Journal thread) you should see an icon for a pencil which allows you to edit the photo. Click on it and then either select a photo from the gallery of your photos if it shows any or just upload a new photo using the upload button. It's easy like Sunday Morning.