diff --git a/Gemfile b/Gemfile
index ab0fe33..85db2d0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -82,3 +82,5 @@ group :production do
 end
 
 gem 'high_voltage', '~> 2.4.0'
+
+gem 'simple_form'
diff --git a/Gemfile.lock b/Gemfile.lock
index 4ffca3f..3a644d4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -217,6 +217,9 @@ GEM
     select2-rails (3.5.9.3)
       thor (~> 0.14)
     sexp_processor (4.6.0)
+    simple_form (3.1.1)
+      actionpack (~> 4.0)
+      activemodel (~> 4.0)
     spring (1.3.6)
     sprockets (3.3.4)
       rack (~> 1.0)
@@ -276,6 +279,7 @@ DEPENDENCIES
   sass-rails (~> 5.0)
   sdoc (~> 0.4.0)
   select2-rails
+  simple_form
   spring
   sqlite3
   turbolinks
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 16a8765..0bc2cd0 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -11,10 +11,19 @@ class ApplicationController < ActionController::Base
     @current_client ||= identify_client
   end
 
+  def current_ability
+    if current_user
+      @current_ability ||= Ability.new(current_user)
+    elsif current_client
+      @current_ability ||= ClientAbility.new(current_account)
+    end
+  end
+
   private
 
   def identify_client
     key = request.headers["X-API-KEY"]
     Client.find_by key: key if key
   end
+
 end
diff --git a/app/models/client_ability.rb b/app/models/client_ability.rb
new file mode 100644
index 0000000..1f804eb
--- /dev/null
+++ b/app/models/client_ability.rb
@@ -0,0 +1,8 @@
+class Ability
+  include CanCan::Ability
+
+  def initialize(client)
+    client ||= Client.new # guest user (not logged in)
+    can :manage, :all
+  end
+end
diff --git a/app/views/transactions/new.html.haml b/app/views/transactions/new.html.haml
index d65c6d5..68d35f0 100644
--- a/app/views/transactions/new.html.haml
+++ b/app/views/transactions/new.html.haml
@@ -1,6 +1,6 @@
 = @transaction.errors.full_messages.join(", ")
-= form_for @transaction do |f|
+= simple_form_for @transaction do |f|
   = f.collection_select :creditor_id, User.all, :id, :name, {}, { class: 'select2-selector' }
-  = f.number_field :amount
-  = f.text_field :message, required: true
+  = f.input :amount
+  = f.input :message, required: true
   = f.submit "Send it!"