Few things to check, if you are using the IAM account to launch the cluster check you have necessary permissions to launch the instances with required type.
Check that you have IAM permission to launch the paid MapR cluster.
As you are a new user, you dont have permissions to upload the attachments. As time passes and based on the interaction with the forum you will get the access to upload.
I asked my Forum team to update your permission levels, now you can upload the attachments.