Add signUpUser method.

JTankTrouble.iml

 <?xml version="1.0" encoding="UTF-8"?>
 <module type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_9" inherit-compiler-output="true">
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
@@ -9,4 +9,3 @@
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
 </module>
\ No newline at end of file
-

src/LoginFrame.java

@@ -65,5 +65,18 @@ public class LoginFrame extends JFrame {
 
 
     }
+    public void signUpUser(File accounts) {
+        try (FileWriter fileWriter = new FileWriter(accounts, true)) {
+            fileWriter.write(userName.getText() + " " + passwordField.getText() + " " + remindMe.isSelected() + " 0 0 0 0 0 " + "\n");
+            JFrame signUpMessage = new JFrame();
+            ImageIcon icon = new ImageIcon("pictures/logo.png");
+            JOptionPane.showMessageDialog(signUpMessage, "Successfully registered.", "", JOptionPane.INFORMATION_MESSAGE, icon);
+        } catch (Exception ex) {
+            System.out.println("No account found ! ");
+            ex.printStackTrace();
+        }
+
+    }
+
 
 }