How can I get the the location of the text box

I'm new in Selenium and try to get the Textbox using Xpath but it's not working as it says can't find the string path.

this is what I trying:

[FindsBy(How = How.XPath,Using = ".//input[@index='0']")]
    public IWebElement SearchFlightFrom { get; set; }

this the html :

<div>
<div class="waypoint-container">
    <div class="float-left margin-right locationSelector" style="position: relative;z-index: 1">
        @Html.NgLabelFor(waypoint => waypoint.LocationLabel, new { @class = "block-display" })
        <input id="from{{$index}}" name="Location" index="{{$index}}" location-is-valid="locationIsValid" is-valid="locationIsValid" auto-complete-box get-validator-options="getLocations" on-selection="updateAutoCompleteSelection" get-auto-complete-options="locationSearch" class="airport-auto-complete waypoint-location-{{$index}}" ie-placeholder="true" ng-model="waypoint.Location" placeholder="Enter place or airport" required="" tabindex="{{getTabIndex($index,0)}}" type="text" ng-blur="onLocationChange($index)" ng-focus="onLocationFocus()"></input>
        <validation-message err-message="'Location is not valid'" is-show="locationIsValid!=null &&!locationIsValid && locationWasBlured" left="80px" top="24px" width="150px" flipped="'false'" />
    </div>
    <div class="float-left margin-right" ng-show="waypoint.ShowDate">
        @Html.NgLabelFor(waypoint => waypoint.DateLabel, new { @class = "block-display" })
        <input ng-keydown="onDatePickerWayPointBlur($event)" autocomplete="off" type="text" class="begin-trip-date date-input datepicker-padding" name="Date" data_index="{{$index}}" placeholder="ddMMMyy" ng-model="waypoint.Date" tabindex="{{getTabIndex($index,2)}}" ie_placehoder="true" ui-date="waypoint.datePickerOptions" ui-date-time-format="{{DateFormat.datepicker}}" ng-required="waypoint.ShowDate" />
    </div>
    <div class="float-left margin-right" ng-show="waypoint.ShowDate">
        <label>&nbsp;</label>
        <select ng-model="waypoint.SelectedDateType" ng-options="dateType as dateType.Text for dateType in waypoint.DateTypes"
                chosen="{width:'105px'}" disable-search="true" tabindex="100">
            <option value=""></option>
        </select>
    </div>

I want to get this location for adding some text

Try this xpath: //input[@placeholder='Enter place or airport']
And then first click on it using click method and then you can send the value in the input field.