For any wallet, if you want to really use it, you have to wait to find peers to connect to and sync. However, the view you've shown if for the transactions, try to use the mining tab for mining.
Unfortunately I don't know MUE, so I can't help very much on that.
About "other alt currency" it depends very much on which currency and what hardware you have.
You can try to mine any coin with your CPU but in most cases you'll waste electricity with tiny to no reward at all.
Some coins can be mined with GPU, but in most cases (electricity cost, computer configuration, coin chosen) it may be cheaper to buy than to mine.
Now this being said, most coins are not mined efficiently (or at all) from wallet. Instead there are specialized mining programs.
For CPU mining there's this one
https://bitcointalk.org/index.php?topic=1326803.0;topicseen among many other.
For GPU mining there's Claymore's and other miners, it depends if your GPU is AMD or GeForce.
It's an equation with a lot of variables and I don't know very well what you want to know.
