First, close the Spectrecoin program.
To restore your wallet backup, you must put the backed up .dat file inside the Spectrecoin "data directory".
The location of this data directory for the different operating systems is:
* Windows: C:\Users\Username\AppData\Roaming\SpectreCoin
* Linux: ~/.spectrecoin
* Mac OS: ~/Library/Application Support/SpectreCoin
You must rename your backup to "wallet.dat" and place it inside this directory.
If there is an existing "wallet.dat" file, rename that file first, e.g. to "wallet-old.dat".
After you have installed your wallet.dat file here, start the program. You should now see your addresses and funds.