In order to upload photos to Picasaweb you need a Google account. If you have one, you can use the same and in case you don't have a Google account, create one. Once you've set up your Google account go to http://picasaweb.google.com and sign-in. You will now be taken to your main Picasaweb homepage also known as the gallery.
Click the Upload button to create a Picasaweb album.Fill in all necessary details like the album name, description (if any) and set Privacy settings. After setting up all, you can now click browse and select photos to upload to your Picasaweb album.
All the selected photos will be uploaded to your Picasaweb album!
The other way of uploading photos to Picasaweb is through an external or third party photo Uploader. Say PicBackMan. Download and Install it for free. The first time users will have to create an account in order to start using it.
Now On the accounts tab, associate your online accounts i.e. Facebook, Flickr, Picasa, Skydrive, dropbox, Google Drive, Photobucket etc.
Now click 'Photos' Tab and then click on 'Associate Folder'. Browse to associate the folder where your photos are stored on your computer. Then click on the online service where you wish to upload photos. Once you have associated the accounts, click upload button the the bottom on the window. That's it. All the photos in your folder will be safely stored on the accounts you associated.
You can install PicBackMan's Picasa uploader for Mac from the website and start backing up photos and videos.
Quick Tip to Keep your Photos Safe
Making backups of your photos & videos is a chore you probably skip, but it really doesn't have to be hard. Here's an effortless way to backup photos - PicBackMan. PicBackMan is the easiest and simplest way to keep your photos safely backed up in one or more online accounts. Simply download PicBackMan (it's free!), register your account, connect to your online store and tell PicBackMan where your photos are - PicBackMan does the rest, automatically. It bulk uploads all photos and keeps looking for new ones and uploads those too. You don't have to ever touch it.