You should always use the Linux Questions site search to see if your question has been asked and answered before you post a question. This is a very common topic. If you had clicked on "Search" then clicked on "Advanced Search" you could search for discussion tags. In the tag box you could type in the word "mount" and a list of tags that start with that word would appear. You choose one of the tags and press the "Search" button at the bottom of the page. Here is one of the discussions that you could have found using this method.
Basically you create a mount point. A mount point is just a directory. Then you use the mount command to connect the device/partition to the mount point.
Note that if the mount point that you want already exists then you don't have to create a new one. You just use the mount command.
Log on as root and enter the following commands. These commands work if your Flash card shows up in Linux as /dev/sda1.
mount /dev/sda1 /mnt/flash
If you had to create the mount point then you will probably have to change the permissions on the mount point after the partition is mounted to allow normal users to access the Flash card.
chgrp users /mnt/flash
chmod g+rwx /mnt/flash