First of all you you need to be connected to internet via wifi or your provider’s mobile internet connection.
Before uploading photos to flickr.com via Resco Photo Viewer you need to create an account and sign up.
After creating the account and signing in it is necessary to sign out before setting up the Resco Photo Viewer.

Then open the Resco Photo Viewer, open folder or photo you want to upload and tap on Action>Send To>Publish to web.
Wait until Flickr.com appears in the "Choose your Web album service" and tap next.

Check photo(s) that you want to upload, or reorganize the photos as you want.
Tap Next and resize photos as you desire and click finish.

A pop up window will appear that you need to sign in to your flickr account and allow the access.

The Internet Explorer will open immediately. Sign in to your account, and tap on “OK, I’LL ALLOW IT” that you want to link to your flickr account.
Then sign out. Then click on Yes in the question that you signed in and allowed access to flickr.com.
The photo(s) wil be uploaded immediately.
After this, if you want to upload any picture, just select it, and follow the instructions of uploading wizzard, because your uploading is set up.
Important: After each signing in to flickr.com, you need to sign off, and also do not use automatic signing in because this cause that you will not be able to upload pictures via Photo Viewer.
You have to get throught these instructions after each reseting account in uploading wizzard in Picture Viewer.
The other way how to send your pictures or photos.
Here you can find how to send your pictures to your friends.