with openSSH installed on your iPhone, you can connect using any SSH program...that's all you need. iFunbox works differently I believe, it is not SSH, but requires a direct connection (via USB)...if it is anything like iExplorer, it won't allow access to locked directories, so would be useless for things like uploading dreamboard themes.
If you google SSH application windows (or mac if that's what you're using), then you will find several apps you can use to SSH into your phone. To connect, select SSH connection, then go into settings>wifi on your iPhone and look for the wifi IP address that is listed for your phone. This is the "address" you will be connecting to via your SSH program. The username is root, and the default password is alpine
WARNING: It is VERY IMPORTANT that you change your password as soon as possible. Without doing so, ANYONE can theoretically gain access to your phone, and do whatever they want...download pictures, texts, install viruses, delete vital system files, etc. It is pivotal that you are very careful with this. Also, make sure you don't delete anything from SSH unless you are sure what it does and know you need to remove it. There are no safeties on SSH...you could delete important files that keep your phone from working properly.
To change your password: Open up terminal (on mac/linux) or a terminal program on windows, and enter the following:
ssh root@<your iPhone's IP address...note there is no space between this and the @ sign>
yes
it will now prompt you for a password. enter alpine. Then enter:
passwd
it will ask you for the new password. Enter it twice, and your password will be changed. Don't forget it!
Hope this has been helpful