<form class="form-inline">
    <div class="form-group">
        <label for="exampleInputName2">Name</label>
        <input type="text" class="form-control" id="exampleInputName2" placeholder="Jane Doe">
    </div>
    <div class="form-group">
        <label for="exampleInputEmail2">Email</label>
        <input type="email" class="form-control" id="exampleInputEmail2" placeholder="jane.doe@example.com">
    </div>
    <button type="submit" class="btn btn-default">Send invitation</button>
</form>