Fixed using Ctrl+A in the console and added splits

tmux/tmux.conf

@@ -2,11 +2,17 @@
 set -g prefix C-a
 # ... not Ctrl+B, which is the default
 unbind C-b
+# ... and pressing Ctrl+A twice sends the Ctrl+A
+bind C-a send-prefix
 
 # Panes and Windows start at index 1, not 0
 set -g base-index 1
 set -g pane-base-index 0
 
+# using "|" and "-" for splits
+bind \\ split-window -h
+bind - split-window -v
+
 # Ctrl+Enter creates a new tab
 bind Enter new-window